Use His Spear Against His Shield
Updated 2026-08-10
INTRODUCTION
English translation pending.
CORE DEFINITION
Use His Spear Against His Shield comes from the classical Chinese story of a seller who claimed his spear pierced everything and his shield resisted everything, and was asked what would happen if the two met. Its core proposition is that an internally contradictory position can be defeated using its own premises, without importing any outside evidence. The key qualifier is fidelity to the original claim: the technique fails if the opponent's position is restated in a weaker form that they do not actually hold.
SCAFFOLDING EFFECT
Reduce cognitive load
- Premise extraction: state the opponent's claims exactly as they themselves actually hold them to be. - Contradiction search: look for two of their claims that simply cannot both be true. - Self-refutation move: apply their own logic to their own conclusion rather than bringing in new evidence.
Anchor fast decisions
A claim set that contains a contradiction cannot be wholly true, and the contradiction is discovered by holding the premises together rather than by comparing them with the world. Because the refutation uses the opponent's own commitments, it cannot be dismissed as an outside standard. This makes it persuasive to the very audience that accepts those premises.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- zdic.nethttps://www.zdic.net/hans/%E4%BB%A5%E5%AD%90%E4%B9%8B%E7%9F%9B%EF%BC%8C%E6%94%BB%E5%AD%90%E4%B9%8B%E7%9B%BEverified
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